TWI Scanner Example problem

RE: TWI Scanner Example problem

simon1516 — Tue, 02 Jun 2020 11:53:27 GMT

[quote userid="2111" url="~/f/nordic-q-a/61887/twi-scanner-example-problem/252689"]you may need to flip the DK and check if any of the pins have specific usage by default (since they are DK).[/quote]

Thats it! I used other pin´s, I thought it would working with every pin. But on nRF52833 DK just p0.26 and p0.27 are used for SDA and SCL.

Thanks for help.

RE: TWI Scanner Example problem

Kenneth — Tue, 02 Jun 2020 11:14:04 GMT

Any pins should in theory be possible to use for SCL/SDA, however you may need to flip the DK and check if any of the pins have specific usage by default (since they are DK).

I notice on your first picture you wrote PCA10010, while it should be PCA10100.

Kenneth

RE: TWI Scanner Example problem

simon1516 — Thu, 28 May 2020 17:19:29 GMT

I think I have an issue because of

[quote userid="88554" url="~/f/nordic-q-a/61887/twi-scanner-example-problem"] I change SCL and SDA Pin to 33 and 34 (P1.02 and P1.03 of nRF52833 DK) as shown in screenshot attached (here I´m not sure with!).[/quote]

Could you please confirm that this is okay for I2C Pin´s?

RE: TWI Scanner Example problem

simon1516 — Thu, 28 May 2020 17:01:04 GMT

Update: After a few tries, it works now. Please don´t ask me, what I´ve done wrong before. I got the message "TWI scanner started." by UART.

Unfortunaly, I don´t get a message "TWI device detected at address 0x%x.", allthough "detected_device"=true

Do you have an idea for that?

In addition to that, I buy a logic analyzer for future, but shipping is about 1 week :-/

RE: TWI Scanner Example problem

simon1516 — Thu, 28 May 2020 13:42:34 GMT

Hi,

after doing this, I got an error when trying to compile.

I also looked at this thread

But the steps are the same like you described. When I successful build and run the example without modification I have tried to set an digital output to high - it doesn´t work. So it seems that the Pin´s are not mapped correctly. Can you help me with this error and have a look to my configuration? I just show you the modified rows attached.

thanks in advance

Simon

RE: TWI Scanner Example problem

Kenneth — Thu, 28 May 2020 11:19:12 GMT

I made some screenshots on how to turn an nRF52840 (PCA10056) project into an nRF52833 (PCA10100) project. Hope it helps.

If you still have issues I suggest to get an logic analyzer (e.g. https://www.saleae.com/) to check out data on the SCL and SDA pins.